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The unfurling of a Japanese solar sail, the first demonstration of a new space propulsion technology, went exactly according to plan. According to JAXA’s blog posts and photos from the event, the IKAROS spacecraft’s sail appears to be in place. It’s a big step in its attempt to travel driven only by sunlight. “This is the first sail ever deployed in space, and if they succeed in using it for solar-sail flight — it’ll still be a few weeks before we know that — it’ll be a milestone,” said Louis Friedman , executive director of the Planetary Society, an organization dedicated to promoting space exploration, which is readying its own solar-sailing mission